1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
|
/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC Host driver.
*
* Global TODO's across the driver to be added after initial base
* patches are accepted upstream:
* 1) Enable DMA support.
* 2) Enable per vring interrupt support.
*/
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/mic_common.h>
#include "../common/mic_device.h"
#include "mic_device.h"
#include "mic_x100.h"
#include "mic_smpt.h"
#include "mic_fops.h"
#include "mic_virtio.h"
static const char mic_driver_name[] = "mic";
static DEFINE_PCI_DEVICE_TABLE(mic_pci_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2250)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2251)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2252)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2253)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2254)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2255)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2256)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2257)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2258)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2259)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225a)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225b)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225c)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225d)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225e)},
/* required last entry */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, mic_pci_tbl);
/* ID allocator for MIC devices */
static struct ida g_mic_ida;
/* Class of MIC devices for sysfs accessibility. */
static struct class *g_mic_class;
/* Base device node number for MIC devices */
static dev_t g_mic_devno;
static const struct file_operations mic_fops = {
.open = mic_open,
.release = mic_release,
.unlocked_ioctl = mic_ioctl,
.poll = mic_poll,
.mmap = mic_mmap,
.owner = THIS_MODULE,
};
/* Initialize the device page */
static int mic_dp_init(struct mic_device *mdev)
{
mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
if (!mdev->dp) {
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->dp_dma_addr = mic_map_single(mdev,
mdev->dp, MIC_DP_SIZE);
if (mic_map_error(mdev->dp_dma_addr)) {
kfree(mdev->dp);
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
return 0;
}
/* Uninitialize the device page */
static void mic_dp_uninit(struct mic_device *mdev)
{
mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
kfree(mdev->dp);
}
/**
* mic_shutdown_db - Shutdown doorbell interrupt handler.
*/
static irqreturn_t mic_shutdown_db(int irq, void *data)
{
struct mic_device *mdev = data;
struct mic_bootparam *bootparam = mdev->dp;
mdev->ops->ack_interrupt(mdev);
switch (bootparam->shutdown_status) {
case MIC_HALTED:
case MIC_POWER_OFF:
case MIC_RESTART:
/* Fall through */
case MIC_CRASHED:
schedule_work(&mdev->shutdown_work);
break;
default:
break;
};
return IRQ_HANDLED;
}
/**
* mic_ops_init: Initialize HW specific operation tables.
*
* @mdev: pointer to mic_device instance
*
* returns none.
*/
static void mic_ops_init(struct mic_device *mdev)
{
switch (mdev->family) {
case MIC_FAMILY_X100:
mdev->ops = &mic_x100_ops;
mdev->intr_ops = &mic_x100_intr_ops;
mdev->smpt_ops = &mic_x100_smpt_ops;
break;
default:
break;
}
}
/**
* mic_get_family - Determine hardware family to which this MIC belongs.
*
* @pdev: The pci device structure
*
* returns family.
*/
static enum mic_hw_family mic_get_family(struct pci_dev *pdev)
{
enum mic_hw_family family;
switch (pdev->device) {
case MIC_X100_PCI_DEVICE_2250:
case MIC_X100_PCI_DEVICE_2251:
case MIC_X100_PCI_DEVICE_2252:
case MIC_X100_PCI_DEVICE_2253:
case MIC_X100_PCI_DEVICE_2254:
case MIC_X100_PCI_DEVICE_2255:
case MIC_X100_PCI_DEVICE_2256:
case MIC_X100_PCI_DEVICE_2257:
case MIC_X100_PCI_DEVICE_2258:
case MIC_X100_PCI_DEVICE_2259:
case MIC_X100_PCI_DEVICE_225a:
case MIC_X100_PCI_DEVICE_225b:
case MIC_X100_PCI_DEVICE_225c:
case MIC_X100_PCI_DEVICE_225d:
case MIC_X100_PCI_DEVICE_225e:
family = MIC_FAMILY_X100;
break;
default:
family = MIC_FAMILY_UNKNOWN;
break;
}
return family;
}
/**
* mic_device_init - Allocates and initializes the MIC device structure
*
* @mdev: pointer to mic_device instance
* @pdev: The pci device structure
*
* returns none.
*/
static void
mic_device_init(struct mic_device *mdev, struct pci_dev *pdev)
{
mdev->family = mic_get_family(pdev);
mdev->stepping = pdev->revision;
mic_ops_init(mdev);
mic_sysfs_init(mdev);
mutex_init(&mdev->mic_mutex);
mdev->irq_info.next_avail_src = 0;
INIT_WORK(&mdev->reset_trigger_work, mic_reset_trigger_work);
INIT_WORK(&mdev->shutdown_work, mic_shutdown_work);
INIT_LIST_HEAD(&mdev->vdev_list);
}
/**
* mic_device_uninit - Frees resources allocated during mic_device_init(..)
*
* @mdev: pointer to mic_device instance
*
* returns none
*/
static void mic_device_uninit(struct mic_device *mdev)
{
/* The cmdline sysfs entry might have allocated cmdline */
kfree(mdev->cmdline);
kfree(mdev->firmware);
kfree(mdev->ramdisk);
kfree(mdev->bootmode);
flush_work(&mdev->reset_trigger_work);
flush_work(&mdev->shutdown_work);
}
/**
* mic_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in mic_pci_tbl
*
* returns 0 on success, < 0 on failure.
*/
static int mic_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
struct mic_device *mdev;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev) {
rc = -ENOMEM;
dev_err(&pdev->dev, "mdev kmalloc failed rc %d\n", rc);
goto mdev_alloc_fail;
}
mdev->id = ida_simple_get(&g_mic_ida, 0, MIC_MAX_NUM_DEVS, GFP_KERNEL);
if (mdev->id < 0) {
rc = mdev->id;
dev_err(&pdev->dev, "ida_simple_get failed rc %d\n", rc);
goto ida_fail;
}
mic_device_init(mdev, pdev);
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto uninit_device;
}
pci_set_master(pdev);
rc = pci_request_regions(pdev, mic_driver_name);
if (rc) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto disable_device;
}
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
dev_err(&pdev->dev, "Cannot set DMA mask\n");
goto release_regions;
}
mdev->mmio.pa = pci_resource_start(pdev, mdev->ops->mmio_bar);
mdev->mmio.len = pci_resource_len(pdev, mdev->ops->mmio_bar);
mdev->mmio.va = pci_ioremap_bar(pdev, mdev->ops->mmio_bar);
if (!mdev->mmio.va) {
dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
rc = -EIO;
goto release_regions;
}
mdev->aper.pa = pci_resource_start(pdev, mdev->ops->aper_bar);
mdev->aper.len = pci_resource_len(pdev, mdev->ops->aper_bar);
mdev->aper.va = ioremap_wc(mdev->aper.pa, mdev->aper.len);
if (!mdev->aper.va) {
dev_err(&pdev->dev, "Cannot remap Aperture BAR\n");
rc = -EIO;
goto unmap_mmio;
}
mdev->intr_ops->intr_init(mdev);
rc = mic_setup_interrupts(mdev, pdev);
if (rc) {
dev_err(&pdev->dev, "mic_setup_interrupts failed %d\n", rc);
goto unmap_aper;
}
rc = mic_smpt_init(mdev);
if (rc) {
dev_err(&pdev->dev, "smpt_init failed %d\n", rc);
goto free_interrupts;
}
pci_set_drvdata(pdev, mdev);
mdev->sdev = device_create_with_groups(g_mic_class, &pdev->dev,
MKDEV(MAJOR(g_mic_devno), mdev->id), NULL,
mdev->attr_group, "mic%d", mdev->id);
if (IS_ERR(mdev->sdev)) {
rc = PTR_ERR(mdev->sdev);
dev_err(&pdev->dev,
"device_create_with_groups failed rc %d\n", rc);
goto smpt_uninit;
}
mdev->state_sysfs = sysfs_get_dirent(mdev->sdev->kobj.sd,
NULL, "state");
if (!mdev->state_sysfs) {
rc = -ENODEV;
dev_err(&pdev->dev, "sysfs_get_dirent failed rc %d\n", rc);
goto destroy_device;
}
rc = mic_dp_init(mdev);
if (rc) {
dev_err(&pdev->dev, "mic_dp_init failed rc %d\n", rc);
goto sysfs_put;
}
mutex_lock(&mdev->mic_mutex);
mdev->shutdown_db = mic_next_db(mdev);
mdev->shutdown_cookie = mic_request_irq(mdev, mic_shutdown_db,
"shutdown-interrupt", mdev, mdev->shutdown_db, MIC_INTR_DB);
if (IS_ERR(mdev->shutdown_cookie)) {
rc = PTR_ERR(mdev->shutdown_cookie);
mutex_unlock(&mdev->mic_mutex);
goto dp_uninit;
}
mutex_unlock(&mdev->mic_mutex);
mic_bootparam_init(mdev);
mic_create_debug_dir(mdev);
cdev_init(&mdev->cdev, &mic_fops);
mdev->cdev.owner = THIS_MODULE;
rc = cdev_add(&mdev->cdev, MKDEV(MAJOR(g_mic_devno), mdev->id), 1);
if (rc) {
dev_err(&pdev->dev, "cdev_add err id %d rc %d\n", mdev->id, rc);
goto cleanup_debug_dir;
}
return 0;
cleanup_debug_dir:
mic_delete_debug_dir(mdev);
mutex_lock(&mdev->mic_mutex);
mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
mutex_unlock(&mdev->mic_mutex);
dp_uninit:
mic_dp_uninit(mdev);
sysfs_put:
sysfs_put(mdev->state_sysfs);
destroy_device:
device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
smpt_uninit:
mic_smpt_uninit(mdev);
free_interrupts:
mic_free_interrupts(mdev, pdev);
unmap_aper:
iounmap(mdev->aper.va);
unmap_mmio:
iounmap(mdev->mmio.va);
release_regions:
pci_release_regions(pdev);
disable_device:
pci_disable_device(pdev);
uninit_device:
mic_device_uninit(mdev);
ida_simple_remove(&g_mic_ida, mdev->id);
ida_fail:
kfree(mdev);
mdev_alloc_fail:
dev_err(&pdev->dev, "Probe failed rc %d\n", rc);
return rc;
}
/**
* mic_remove - Device Removal Routine
* mic_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device.
*
* @pdev: PCI device structure
*/
static void mic_remove(struct pci_dev *pdev)
{
struct mic_device *mdev;
mdev = pci_get_drvdata(pdev);
if (!mdev)
return;
mic_stop(mdev, false);
cdev_del(&mdev->cdev);
mic_delete_debug_dir(mdev);
mutex_lock(&mdev->mic_mutex);
mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
mutex_unlock(&mdev->mic_mutex);
flush_work(&mdev->shutdown_work);
mic_dp_uninit(mdev);
sysfs_put(mdev->state_sysfs);
device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
mic_smpt_uninit(mdev);
mic_free_interrupts(mdev, pdev);
iounmap(mdev->mmio.va);
iounmap(mdev->aper.va);
mic_device_uninit(mdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
ida_simple_remove(&g_mic_ida, mdev->id);
kfree(mdev);
}
static struct pci_driver mic_driver = {
.name = mic_driver_name,
.id_table = mic_pci_tbl,
.probe = mic_probe,
.remove = mic_remove
};
static int __init mic_init(void)
{
int ret;
ret = alloc_chrdev_region(&g_mic_devno, 0,
MIC_MAX_NUM_DEVS, mic_driver_name);
if (ret) {
pr_err("alloc_chrdev_region failed ret %d\n", ret);
goto error;
}
g_mic_class = class_create(THIS_MODULE, mic_driver_name);
if (IS_ERR(g_mic_class)) {
ret = PTR_ERR(g_mic_class);
pr_err("class_create failed ret %d\n", ret);
goto cleanup_chrdev;
}
mic_init_debugfs();
ida_init(&g_mic_ida);
ret = pci_register_driver(&mic_driver);
if (ret) {
pr_err("pci_register_driver failed ret %d\n", ret);
goto cleanup_debugfs;
}
return ret;
cleanup_debugfs:
mic_exit_debugfs();
class_destroy(g_mic_class);
cleanup_chrdev:
unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
error:
return ret;
}
static void __exit mic_exit(void)
{
pci_unregister_driver(&mic_driver);
ida_destroy(&g_mic_ida);
mic_exit_debugfs();
class_destroy(g_mic_class);
unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
}
module_init(mic_init);
module_exit(mic_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) MIC X100 Host driver");
MODULE_LICENSE("GPL v2");
|